Information Disclosure in TYPO3 Backend

Categories: TYPO3 CMS Created by Nicole Cordes
It has been discovered, that TYPO3 is susceptible to Information Disclosure.

Component Type: TYPO3 CMS

Release Date: July 19, 2016

Vulnerable subcomponent: Backend

Vulnerability Type: Information Disclosure

Affected Versions: Versions 6.2.0 to 6.2.25, 7.6.0 to 7.6.9 and 8.0.0 to 8.2.0

Severity: Low

Suggested CVSS v2.0: AV:N/AC:M/Au:N/C:P/I:N/A:N/E:P/RL:O/RC:C

CVE: not assigned yet

Problem Description: The TYPO3 backend module stores the username of an authenticated backend user in its cache files. By guessing the file path to the cache files it is possible to receive valid backend usernames.

Solution: Update to TYPO3 versions 6.2.26, 7.6.10 or 8.2.1 that fix the problem described.

Credits: Thanks to Matthias Kappenberg who discovered and reported the issue.

General Advice: Follow the recommendations that are given in the TYPO3 Security Guide. Please subscribe to the typo3-announce mailing list.

General Note: All security related code changes are tagged so that you can easily look them up on our review system.